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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2016
Income Tax Disclosure [Abstract]  
Summary of Provision for Income Taxes and U.S. Federal Tax Rate
The provision for income taxes differs from amounts computed by applying the U.S. federal tax rate of 35% to income before income taxes for the three months ended September 30, 2016 and 2015 due to the following (in thousands):
 
 
 
2016
 
2015
Computed “expected” tax expense
 
$
59,571

 
35.0
 %
 
$
57,875

 
35.0
 %
Changes resulting from:
 
 
 
 
 
 
 
 
Foreign income tax differential
 
(4,265
)
 
(2.5
)%
 
(5,860
)
 
(3.5
)%
Excess tax benefits related to stock-based compensation
 
(8,247
)
 
(4.9
)%
 
—

 
—
 %
State taxes net of federal benefits
 
1,678

 
1.0
 %
 
2,501

 
1.5
 %
Foreign-sourced nontaxable income
 
(6,691
)
 
(3.9
)%
 
(2,344
)
 
(1.4
)%
Domestic production activities deduction
 
(4,282
)
 
(2.5
)%
 
(7,950
)
 
(4.8
)%
Other
 
2,822

 
1.7
 %
 
4,365

 
2.6
 %
Provision for income taxes
 
$
40,586

 
23.9
 %
 
$
48,587

 
29.4
 %